Optimizing Linux with cheap flash drives

On the NAND flash with a software translation layer:
/ rootfs ro,relatime
/mnt/.lfs j4fs rw,relatime
/system rfs ro,relatime
/dbdata rfs rw,relatime
/cache rfs rw,relatime

On the internal SD device:
/data rfs rw
/mnt/sdcard vfat rw,dirsync,noatime,nodiratime
/mnt/sdcard/external_sd vfat rw,dirsync,noatime,nodiratime

Thus, rfs and normal vfat are both used. The rfs description reminded me of the phase tree FAT implementation that was going around a long time ago.

The software translation for the NAND flash is GPL.